Rotary filter.



No. 820,560. PATENTED MAY 15, 1906. F. A. EVANS.

ROTARY FILTER.

APPLICATION FILED APR. 29. 1905.

2 SHEETS-SHEET 1.

FL'yUZ 'No. 820,560. PATENTED MAY 15, 1906. F. A. EVANS.

ROTARY FILTER.

APPLIUATION FILED APR. 29. 1905.

2 SHEETS-SHEET 2.

' extended upwar UNITED sTATEs PATENT OEEIOE.

FRANK AT EVANS, OF REDWOOD FALLS, MINNESOTA. Y

ROTARY FILTER.

Specification of Letters Patent.

Patented May 15, 1906.

Application filed April 29, 1905. Serial No. 258,009.

the invention, such as will enable others skilled in the art to which it=appertains to make and use the same.

My invention has for its object to provide a simple and highly efficient separator for separating liquids from granular or ulverized solid materials; and to these on s the invention consists of the novel devices and combinations of devices hereinafter de-. scribed, and defined in the claims.

The improved device effects the se aration of the liquid and solid matter by ltration, and hence from one point of view is a filtering device.

The improved separator is illustrated in the accompanying drawings, wherein like characters lndicate like parts throughout the several views.

Figure 1 is a plan view with some parts broken away, showing the improved separator. Fig. 2 is a verticalsection taken approximately on the line m m of Fig. 1; and

ig. 3 is a detail in vertical section taken approximately on the line 00 m of Fig. 1, some parts being removed.

The numeral 1 indicates a base-plate or,

sup ort having an annular bearing-hub 2, wit 'n the cavity of which works a gland 3 of a stuffing-box, which subject to nutted studs 4.

The numeral 5 indicates an annular trough-like pan of a rotary filter. This pan is rigidly secured to the radial arms of a su portin -s ider 6, the hub of which is loose y journa e on the bearing-sleeve 2 and, as

shown, is directly supported by bearingballs 7. p a The numeral 8 indicates a vertically-dis posed discharge-sleeve, the upper end of which is rigidly secured to a supplemental spider 9, which in turn is secured to the said spider 6. The u per end of the sleeve 8. is

d at 93 to aflord a bearingpost, and this extension is s'hown as provided with a supporting-collar 9 for a purpose gland is shown as which will hereinafter appear. The sleeve 8 is thus mounted to rotate with the annular pan 5 and to work with a tight joint through the stuffing-box 3 and within the fixed bear- 1 ing-hub 2. discharge-pipe 10 is screwed into the bottom of the plate 1 and forms an extension of the rotary sleeve 8.

The washpan 5 is provided with an inwardly-inclined bottom plate 11, and above this bottom plate it is formed with short radial arms 12, that rigidly connect the inner and outer annular walls of the said pan 5.

The arms 12 support a perforate or reticulate false bottom 13, u on which is preferably laced a layer of porous cloth 14. Upon t e fiporous cloth 14 is placed a thick layer of tering material, such as sharp sand or finely-pulverized rock 2. It will. be noted that the upper edge of the outer wall of thewashpan 5 is made V sha e or is brought to a sharp edge, and it will also be note' that this sharp edge is located considerably below the plane of the upper edge of the inner wall' of said pan. Both of these features are important, as will presently apear. p The bottom of the annular pan 5 is in communication with the upper end of the dischargesleeve 8 through a plurality of slightly-v inclined drainipes 15.

The material to be filtered or washed will usually be delivered in a continuous stream onto the sand bed '2 through a spout 16 or other suitable delivery device. The annular filter-pan 5 will be continuously rotated in a constant direction-as shown, for example, in Fig. 1 by the arrow marked thereon through suitable driving mechanism, preferably comprising a worm-gear 17, rigidly on the hub of the s ider 6, and a counter-shaft 18, having a be t-driven .pulley 19 and a worm 20, the latter of which meshes into" said worm-gear. I

In front of the delivery end of the spout 16 is a plow-like scraper 21, which is made up of two overlapping sections adjustably secured to ,.a bar 22, which bar in turn is pivotally connected vat its outer end to a head 23, rigidly supported outside of the rotary filteringpan 5. Theinner end of the'bar 22 is sup- I ported by a rod 24, provided at its inner end with a head 25, that rests loosely around the upper end of the stud 9 and upon the collar thereof. A threaded outer end of this rod 24 works through a perforation in the inner end of the bar 22 and is adjustably clamped inner andouter walls of the said rotary pan.

The numeral 27 indicates a catch-spout, which is secured in a fixed position by any suitable means (not shown) and stands in position to receive materials scraped from the rotary pan by the scraper 21.

Rearward of the delivery end of the spout 16 is a rake made up of abar 28 and dependiugteeth 29,- whichrake extends across the channel of the pan, with its teeth terminating slightly abovethe upper surface of the san or filtering medium 2.. As shown, the outer end of the bar 28 is pivotally attached to the fixed head 23, while the inner end thereof is perforated to pass the end of the threaded rod 30. Said rod 30 is rigidly secured to the i scraper-supporting bar 22, and on the threadgled or they ed outerend of said rod is a pair of nuts 31,

that clamp the front end of the bar 28' between them and adjustably hold said bar.-

The numeral 32 indicates a spraying-pipe Y which extends across the channel of the pan 35 spray ,of water dischar'gin therefrom will be caught in the channel of t f Operation: The device capable of general use for separating liquid 5 and is perforated at its underside, so that a e said rotary pan. above described is and solid materials." These liquids and solids may-be delivered to the pan either comminmaybe delivered thereto separately and commingle in the pan In using the device to reclaim cyanid of potassium from placer-sands or crushed rock the two maybe delivered into the pan in a continuous stream. through the spout 16, and under the'rotation of the pan and under the action of the "rake-teeth '29 they will be spread out in an even layer upon the upper surface of the sand filter 2. In Fig. 3 the 1 placer-sand is indicated bythe character 2.

The filtering-pan 5 will in practice be made of. large diameter and will be slowly rotated, so that the placer-sand or crushed rock will be carried fer a considerable interval of time (usually from one to two minutes) before they are brought a ainst thescraper 21"'under the rotation of the pan. anid from the sand or crushed ore, it will usually be found desirable to turn ona spray of water from the'pipe 32. Under the slow rotation of the pan-the water and the cyanid To wash the 'cy of potassium, together with any metal held in thesolution by the latter, will be given time to percolate or seep through the sand bed .2

' onto the bottom 11 of said pan, from whence they may run through the drain-pipes 15 into the sleeve 8 and from thence out through the pipe 10 into some suitable receptacle. (Not shown in the drawings.)

Difierent conditions and kinds of solid materials which are being washed or separated from a liquid may require different angular adjustments of the scraper 21, and this is pro vided for by means already described.

From what'has been said it will be seen that the device described is well adapted for use as a separator or filter for se arating liquids from granular or pulverize solid materials in mining operations and that it affords efficient means for reclaiming and saving the water used in the washing process... The very great necessity for saving the water used in washing processes, so that .the same may be where water is extremely scarce ,is well known to minersworking in arid districts. The device is also well adapted for use where the only function sought to be accomplished is .the purification of water. The devlce there-f fore has a large range of utility. It also has an extremely high capacity for performing the work above described.

v From what has been said it will be'under; stood that the device described is capable of many modifications within the scope of my invention as herein set forth and claimed.'

communication with a vacuum-pump, so that a vacuum or suction may be produced in the annular filtering-pan below the filtering medium to assist gravity and to accelerate the rial. The filter described is of course adapts ed for use for filtering various grades and kinds of material, from the very coarsest of ing. 1

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

filter, and means for supplying the solid and liquid materials thereto, of an adjustable scraper working over the up er open portion of said filter for scra ing 0 therefrom the solid materials fromw 'ch the liquid has been drained, substantially as described.

filter and means for supplying the liquid and solid materials thereto, of-a scraper mounted for longitudina and angular adjustments and working overt e 0 en portion of said filter, for scraping there om the solid materials from which the liquid has been drained, substantially as descrlbed.

separation of the liquid from the solid mateearth-washing to the very finest of close filter- 2. The'combination with a rotary annular used over and over again in mining districts I If desired, the discharge-pipe 10 may be in 1. The combination with a rotary annular 3. The combination with an annular filter In testimony whereof I ai'fix my signature and arranged for supplying the liquid and inp'resence of two witnesses.

solid materials thereto of an obliquely-set scraper, Working over the upper 0 en portion FRANK EVANS 5 of said filter, and a rake or leve ing device, Witnesses: k

Working over the upper Open portion of said GEO. L. EVANS,

filter, substantiallyas described N. V. R. HUNTER. 

